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CVE-2026-72446 (GCVE-0-2026-72446)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:44
VLAI
Title
ALSA: usb-audio: qcom: reject stream disable with no active interface
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: qcom: reject stream disable with no active interface handle_uaudio_stream_req() resolves an interface index with info_idx_from_ifnum(), which returns -EINVAL when no interface matches. The enable branch and the response: cleanup label both guard against a negative index, but the disable branch does not: it forms info = &uadev[pcm_card_num].info[info_idx] and dereferences it. uadev[].info is a pointer allocated only when a stream is first enabled, so a negative info_idx on the disable path is unsafe in two ways: - If the card was never enabled, .info is NULL and &info[-EINVAL] is a wild pointer; reading info->data_ep_pipe faults (kernel oops). - If the card was enabled at least once (.info allocated) and the disable names an interface that does not match, &info[-EINVAL] points before the allocation; info->data_ep_pipe / info->sync_ep_pipe are an out-of-bounds slab read and, when non-zero, an out-of-bounds 4-byte write (both pipe fields are cleared to 0). That is memory corruption, not just a NULL dereference. The request is reachable from unprivileged local userspace over AF_QIPCRTR. Reject a disable request with no resolved interface, matching the guard the enable path already has.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 326bbc348298ab0946c5560defe024a5f6ef28bb , < 25a867aa5e67a84333fa6e5c21292c5bcff86b90 (git)
Affected: 326bbc348298ab0946c5560defe024a5f6ef28bb , < a22356d1f731553e99aa2707dbd38c659bdd28d8 (git)
Affected: 326bbc348298ab0946c5560defe024a5f6ef28bb , < bdb640be82e645e2828731648f485224d0c2587b (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "sound/usb/qcom/qc_audio_offload.c"
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: qcom: reject stream disable with no active interface\n\nhandle_uaudio_stream_req() resolves an interface index with\ninfo_idx_from_ifnum(), which returns -EINVAL when no interface matches.\nThe enable branch and the response: cleanup label both guard against a\nnegative index, but the disable branch does not: it forms\ninfo = \u0026uadev[pcm_card_num].info[info_idx] and dereferences it.\n\nuadev[].info is a pointer allocated only when a stream is first enabled,\nso a negative info_idx on the disable path is unsafe in two ways:\n\n - If the card was never enabled, .info is NULL and \u0026info[-EINVAL] is a\n   wild pointer; reading info-\u003edata_ep_pipe faults (kernel oops).\n\n - If the card was enabled at least once (.info allocated) and the\n   disable names an interface that does not match, \u0026info[-EINVAL] points\n   before the allocation; info-\u003edata_ep_pipe / info-\u003esync_ep_pipe are an\n   out-of-bounds slab read and, when non-zero, an out-of-bounds 4-byte\n   write (both pipe fields are cleared to 0). That is memory corruption,\n   not just a NULL dereference.\n\nThe request is reachable from unprivileged local userspace over\nAF_QIPCRTR. Reject a disable request with no resolved interface, matching\nthe guard the enable path already has."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires sending a crafted QMI stream-disable request via the AF_QIPCRTR local socket API into the kernel-registered UAUDIO QMI server; it is not reachable over the network or by plugging in USB alone.\nAC:L - An attacker can deterministically trigger the bug by sending enable=0 with a valid usb_token for a probed USB-audio card when no matching interface exists; no race or attacker-uncontrollable memory layout is required.\nPR:L - AF_QIPCRTR permits unprivileged local userspace to deliver QMI requests to the registered service without root or CAP_NET_ADMIN, and the fix commit explicitly states the path is reachable from unprivileged userspace.\nUI:N - Exploitation is a direct programmatic QMI disable request and does not require the victim to mount filesystems, open files, or perform any interactive action at trigger time.\nS:U - The flaw corrupts kernel heap memory within the same kernel security authority; it does not by itself cross a VM, IOMMU, or sandbox boundary to another security domain.\nC:H - When a card was previously enabled, a failed interface lookup yields a negative index that performs an out-of-bounds slab read of endpoint pipe fields before the allocated intf_info array, enabling kernel memory disclosure.\nI:H - The same out-of-bounds path can perform up to two conditional 4-byte writes clearing data_ep_pipe and sync_ep_pipe in adjacent slab memory, constituting exploitable kernel heap corruption rather than a benign crash.\nA:H - If the card was never enabled, info is NULL and indexing with -EINVAL dereferences a wild pointer reading data_ep_pipe, causing a kernel oops/panic and complete local denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:17.542Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/25a867aa5e67a84333fa6e5c21292c5bcff86b90"
        },
        {
          "url": "https://git.kernel.org/stable/c/a22356d1f731553e99aa2707dbd38c659bdd28d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdb640be82e645e2828731648f485224d0c2587b"
        }
      ],
      "title": "ALSA: usb-audio: qcom: reject stream disable with no active interface",
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        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72446",
    "datePublished": "2026-08-15T05:56:56.470Z",
    "dateReserved": "2026-08-09T03:40:39.930Z",
    "dateUpdated": "2026-08-17T05:44:17.542Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72446",
      "date": "2026-09-04",
      "epss": "0.00153",
      "percentile": "0.04777"
    },
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-19T17:10:49+00:00",
      "cve": "CVE-2026-72446",
      "id": "CVE-2026-72446",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: usb-audio: qcom: reject stream disable with no active interface",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72446.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.